[11120] Remove all auras at creature respawn.

This will remove death persistent auras and AI does no longer need to remove any such auras at respawn manually (GM will still see the death persistent aura all until creature respawn).

Signed-off-by: NoFantasy <nofantasy@nf.no>

src/game/Creature.cpp

@@ -454,6 +454,9 @@ void Creature::Update(uint32 update_diff, uint32 diff)
                 lootForBody         = false;
                 lootForSkin         = false;
 
+                // Clear possible auras having IsDeathPersistent() attribute
+                RemoveAllAuras();
+
                 if(m_originalEntry != GetEntry())
                 {
                     // need preserver gameevent state